Ah yes, I forgot about Countess. I originally suggested rules changes on sideway cards as an alternative to how you did it, and honestly still think it solves part of the issue of forgetting to apply such effects.
Edit: If it bothers you, I'm sure I can think of something else. Making all non-kingdom cards or all cards from the third turn on more expensive might do it. Or I just have it say "When you buy a card, take <1>".
Anyhow, I can see why Bureaucracy would be easy to forget. That's why in an original version it had "When you gain a Victory card, any other player may make you put it onto your deck". Now if everyone forgets about it, it's not a rule break. I don't mind Estates being a non-option all that much.
Banisment was supposed to empty the pile. But perhaps that makes the game too fast. I'm going to try it out at least once, though, to see whether I can do the concept some other way.
About Commerce, I think we had similar topics already. I might have slipped up here and used the old wording. Either way, I'll make it state that the Silver gets shuffled into the drawn cards so there is no discard once you revealed those. If you are talking about something that resembles Golem/Tunnel this is a non-issue to me.
The concern about Monarchy makes sense, but I'll have to ponder how to make a "once per turn" trackable.
About Subventions, yeah, I guess I should have dropped it. It was nice before Renaissance came, but now having both looks silly.
I can definitely see that Treason would favor earlier players too much. I have considered a reverse version, but failed to find a good wording for it, yet.
Thanks for liking the others. Those are the ones I'm most comfortable with, too.